compareGenePairs: Compile genePairs comparison matrix
In pcahan1/singleCellNet: cell identity from single cell RNA-Seq data

compile genePairs comparison matrix for users to elucidate the biological significance behind classification results

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compareGenePairs(query_exp, training_exp, training_st, classCol,
  sampleCol = NULL, RF_classifier, numPairs = 20,
  trainingOnly = TRUE)

`query_exp`	the expression matrix of query samples
`training_exp`	the expression matrix of training samples
`training_st`	the sample table of training data
`classCol`	the column name of the sample table that indicates the classes
`sampleCol`	the column name of the sample table that indicates the sample names. NULL if sample names are indcated in rownames of the sample table
`numPairs`	the number of genes to extract for comparison from most important to least important in the classifier
`cnProc`	the cnProc from the training